Performers are called voice actors/actresses or voice artists, and may also involve singing, although a second voice actor is sometimes cast as the character's singing voice. Voice artists are also used to record the individual sample fragments played back by a computer in an automated announcement system. At its simplest, this is just a short phrase which is played back as necessary, e.g. the Mind the gap announcement introduced by London Underground in 1969. In a more complicated system such as a speaking clock, the voice artist usually doesn't actually record 1440 different announcements, one for each minute of the day, or even 60 (one for each minute of the hour), instead the announcement is re-assembled from fragments such as "minutes past" "eighteen" and "pm". For example, the word "twelve" can be used for both "Twelve O'Clock" and "Six Twelve". So far voice artists have been preferred to speech synthesis because they sound more natural to the listener.

A list of voice acting by one voice actor, one director, or on one subject, is sometimes called a voxography.

It is not unusual to find among the ranks of voice actors people who also act in live-action film or television, or on the stage (see e.g., J. Scott Smart, an "old time radio" actor). For those actors, voice acting has the advantage of offering acting work without having to bother with makeup, costuming, lighting, and so on. An occasional advantage is the fact that through voice acting, an actor can reprise a role that he has played in live action but would be otherwise too aged to portray. An example of this is Walter Koenig in Star Trek New Voyages who reprises his role as Lt. Pavel Chekov.

Notable exceptions to using women to voice young boys' roles are the Peanuts animated specials and films, in which boys were actually cast to read the boys' lines (e.g., Charlie Brown, Linus, Schroeder). In South Park, the authors Trey Parker and Matt Stone are also voice actors for most male roles, especially the boys: Parker voices Stan, Cartman and others while Stone is the voice of Kyle, Kenny, Dead Guy Hubbin and others. South Park kids' voices are pitched up a little in order to seem more "childish". In addition, kindergarten kids on the show are voiced by actual young children for realism. Jason Marsden is also known for young male roles.

Some voice actors, such as Billy West, are highly critical of using movie stars for voices in animated features.[2] A particular point of contention is the practice of bringing in veteran voice actors (who are capable of greatly altering their voices and inflections in order to create personalities for characters) to read for a part, and then use the recording of the professional voice actor as a guide for the movie star, even though the actual character creation work is being done by the unpaid voice actor. West struck back at this practice in Comic Book: The Movie, in which the entire main cast comprises voice actors, including Jess Harnell, Lori Alan, Daran Norris, Mark Hamill and Tom Kenny. The practice of hiring singers to "fill in" for voice actors in a singing role has also seen change, as both Jeremy Irons and Mel Gibson have done singing in the respective films The Lion King and Pocahontas, rather than have a singer as substitute.

Voice actors have a relatively small but dedicated fan base, with appearances at large events like Comic-Con International, various anime conventions, and websites dedicated to profiling their work.

Commercials for television and radio are also cast using voice acting agencies. Ernie Anderson was one of radio's most prominent voices throughout the 1970s and 1980s and was heard on radio stations across the United States. While Don LaFontaine filled the category of "The Voice of God" until his death in 2008, Ashton Smith, Howard Parker and Miguel Ferrer provide most of the narration for movie trailers. Sylvia Villagran is one of the few women working in movie trailers today. David Mark was heard around the world for various radio stations and across the country for Fox TV, UPN TV and ABC TV. Beginning in the early 2000s, many organizations have moved toward a younger, more natural sound; a few notable voice actors in this category are Rick Robles (ABC, Animal Planet and ESPN) , Ethan Erickson (various commercials), Paula Tiso ( various networks, and commercials).

SAG and aliases

A voice actor may be occasionally credited under an alias. Sometimes producers aren't willing to spend the higher cost of hiring members of the Screen Actors Guild, which prohibits its members from taking non-union jobs; but a voice actor needs income, so he or she may take a job under a false name in an attempt to avoid the SAG's notice. If caught, the SAG may respond with fines and suspended health coverage, so the actor has a motivation to do all he can to discourage people from linking his or her name with the alias. There are several unions that actors may belong to; some notable ones are the American Federation of Television and Radio Artists and Screen Actors Guild in the United States and ACTRA and the Union des Artistes (UDA) in Canada. Some actors prefer to remain non union, or "not affiliated" with any guild or union; a notable example of a strictly non union voiceover agency is Vox Talent.

Training and how-to classes

Instruction in how to enter the voiceovers marketplace and how to market one's services is offered at various acting schools and also at adult learning facilities such as Voices For All or Chicago's Discovery Center.

Many VO coaches who have had success in commercial, narration, and animation offer private training, tele-seminars and weekend workshops for both novice and experienced voice actors. The VoiceOver International Creative Experience (VOICE) in Los Angeles is an annual global conference open to all voice actors, coaches, agents, and producers whose goal is to promote community, education, and technology within the VO industry.

Steady work as a voiceover talent in the US is normally possible in major metro areas such as New York, Chicago, and Los Angeles. However, with the rise of online databases and hiring websites, voicing from home is becoming the norm for a lot of voice actors.

In Japan

Japanese voice actors (seiyū) work in radio, television and movies. Their work largely mirrors that of their Western counterparts: performing roles in animated cartoons and video games, performing voice-overs for dubs of non-Japanese movies, and providing narration to documentaries and similar programs.

Because the animation industry in Japan is so prolific, seiyū are able to achieve fame on a national level and are able to have full-time careers as voice-over artists. Japanese voice actors are able to take greater charge of their careers than in other countries. Japan also has the institutions to support the career path, with around 130 seiyū schools and troupes of voice actors that work for a specific broadcast company or talent agency. They often attract their own appreciators and fans who watch shows specifically to hear their favorite actor or actress.

Seiyū frequently branch into music, often singing the opening or closing themes of shows in which their character stars, or become involved in non-animated side projects such as audio dramas (involving the same characters in new storylines) or image songs (songs sung in character that are not included in the anime but further develop the character).

In the Philippines

The Philippine Center for Voice Acting under CreatiVoices Productions is the only institution in the Philippines that promotes voice acting. It also founded the only voice artist group in the region: Society of Young Voice Artists of the Philippines.